Re: [PATCH] arm64: dts: allwinner: enable h616 timer support

["Jernej Škrabec" <jernej.skrabec@gmail.com>]

Dne nedelja, 29. marec 2026 ob 13:43:04 Srednjeevropski poletni čas je Michal Piekos napisal(a):
> Add support for timer by reusing existing sun4i timer driver.
> 
> H616 timer is compatible with earlier sunxi timer variants and provides
> both clocksource and clockevent functionality. It runs from 24 MHz
> oscillator. It can serve as broadcast clockevent for wake up from idle
> states.
> 
> Tested on Orange Pi Zero 3:
> - timer is registered as clocksource:
> - switching clocksource at runtime works
> - timer operates as a broadcast clockevent device
> - no regression observed compared to arch_sys_counter
> 
> Signed-off-by: Michal Piekos <michal.piekos@mmpsystems.pl>
> ---
> Test results:
> 
> Clocksource switching:
>   cat /sys/devices/system/clocksource/clocksource0/available_clocksource
>     arch_sys_counter timer
>   echo timer > /sys/devices/system/clocksource/clocksource0/current_clocksource
>     [ 5031.105997] clocksource: Switched to clocksource timer
> 
> Clockevent configuration:
>   cat /proc/timer_list
>     ...
>     Tick Device: mode:     1
>     Broadcast device
>     Clock Event Device: sun4i_tick
>      max_delta_ns:   178956969070
>      min_delta_ns:   1000
>      mult:           51539608
>      shift:          31
>      mode:           1
>      next_event:     9223372036854775807 nsecs
>      set_next_event: sun4i_clkevt_next_event
>      shutdown:       sun4i_clkevt_shutdown
>      periodic:       sun4i_clkevt_set_periodic
>      oneshot:        sun4i_clkevt_set_oneshot
>      resume:         sun4i_clkevt_shutdown
>      event_handler:  tick_handle_oneshot_broadcast
>     ...
> 
> Cyclictest measurements:
>   Dominated by system scheduler latency and do not reflect clocksource
>   precision.
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> index 8d1110c14bad..bf054869e78b 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h616.dtsi
> @@ -228,6 +228,15 @@ cpu_speed_grade: cpu-speed-grade@0 {
>  			};
>  		};
>  
> +		timer0: timer@3009000 {
> +			compatible = "allwinner,sun50i-h616-timer",
> +				     "allwinner,sun8i-a23-timer";

You have to add above combo to DT bindings.

Best regards,
Jernej

> +			reg = <0x03009000 0xa0>;
> +			interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&osc24M>;
> +		};
> +
>  		watchdog: watchdog@30090a0 {
>  			compatible = "allwinner,sun50i-h616-wdt",
>  				     "allwinner,sun6i-a31-wdt";
> 
> ---
> base-commit: be762d8b6dd7efacb61937d20f8475db8f207655
> change-id: 20260328-h616-timer-046e6ac3549e
> 
> Best regards,
>